|Publication number||US4966441 A|
|Application number||US 07/363,099|
|Publication date||Oct 30, 1990|
|Filing date||Jun 7, 1989|
|Priority date||Mar 28, 1989|
|Publication number||07363099, 363099, US 4966441 A, US 4966441A, US-A-4966441, US4966441 A, US4966441A|
|Inventors||Arlie R. Conner|
|Original Assignee||In Focus Systems, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (34), Non-Patent Citations (28), Referenced by (136), Classifications (17), Legal Events (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation-in-part of my copending application Ser. No. 07/329,938, filed Mar. 28, 1989.
The present invention relates to systems for optically displaying color images, and more particularly relates to a novel color display system that includes a plurality of stacked, light-transmissive panels operating in cooperation with a color mosaic filter.
Much effort has been made in recent years to develop low power color displays. Such efforts have generally employed LCD panels in one of two configurations. In the first configuration, a plurality of differently colored LCD panels are stacked and illuminated with white light. As the light passes through the stacked layers, pixels in each panel act as controllable color filters, selectively coloring the light exiting the display.
While the stacked cell approach can provide a full color display, it has certain shortcomings. One is the requirement of three LCD panels. This large number both increases the cost of the display and reduces its light transmissivity. Furthermore, the stacking of cells often introduces serious parallax problems which severely limit the usable viewing angle.
The second approach uses only a single LCD panel, but uses it in conjunction with a mosaic color filter. The mosaic filter typically has a plurality of red, green and blue filter elements, each aligned with a pixel in the LCD panel. (The filter is often fabricated as an integral part of the LCD assembly.) By controlling the pixels in the LCD panel, the display can pass light through selected areas of the color mosaic filter.
While the color mosaic technique addresses certain shortcomings of the stacked panel approach, it introduces certain problems of its own. One is that brightness is limited because less than a third of the active area transmits light for any given color. Another is that pixel density must be increased by a factor of three to obtain the same resolution as the stacked cell approach. That is, to provide a color display with a horizontal resolution of 640 colored pixels, for example, the LCD panels must have 1920 pixels, 640 each of red, green and blue. This introduces fabrication problems that decrease yields and increase panel costs.
To address these shortcomings of the prior art, the present invention adopts a hybrid approach in which both stacked panels and color mosaic filters are employed. Preferably, only two stacked panels are employed, minimizing the problems conventionally associated with three panel embodiments. Similarly, only two color filter elements are used in the color mosaic filter, again minimizing the problems conventionally associated with the color mosaic approach. The filter colors are desirably selected from the subtractive primaries (cyan, magenta, yellow) so as to increase light transmission. The filter colors and the colors of the two LCD panels are selected so that the two technologies cooperate to provide a full color display.
The foregoing and additional features and advantages of the present invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
FIG. 1 is a schematic view of a color display subassembly according to one embodiment of the present invention.
FIG. 2 is a schematic view illustrating correspondence between a single pixel in a yellow panel with two pixels in a blue panel and two pixels in a color mosaic filter in the display subassembly of FIG. 1.
FIG. 3 illustrates the selective coloring of white light by the display subassembly of FIG. 1.
FIG. 4 is a spectral plot showing ideal and actual light transmission characteristics for a blue LCD panel used in the display subassembly of FIG. 1.
FIG. 5 is a spectral plot showing ideal and actual light transmission characteristics for a yellow LCD panel used in the display subassembly of FIG. 1.
FIG. 6 is a spectral plot showing ideal and actual light transmission characteristics of cyan filter elements used in a color mosaic filter in the display subassembly of FIG. 1.
FIG. 7 is a spectral plot showing ideal and actual light transmission characteristics of magenta filter elements used in a color mosaic filter in the display subassembly of FIG. 1.
FIG. 8 is a chromaticity diagram illustrating the color gamut achieved with the display subassembly of FIG. 1.
FIG. 9 is a schematic illustration of a first application of the present invention.
FIG. 10 is a schematic illustration of a second application of the present invention.
FIG. 11 is a schematic illustration of a variation of the FIG. 10 system.
FIG. 12 is a schematic illustration of another variation of the FIG. 10 system.
To provide an enabling disclosure without unduly lengthening this specification, applicant incorporates by reference the disclosures of U.S. Pat. Nos. 4,547,043, 4,549,174, 4,652,101, 4,709,990 and 4,763,993 which each certain fundamental concepts useful in the construction of a device according to the present invention.
Before proceeding, it may be helpful to first review certain principles of color optics. The primary light colors are generally considered to be red, green and blue. White light is composed of all three primaries. White light with red filtered therefrom (i.e. removed) is termed cyan; white light with green filtered therefrom is termed magenta; and white light with blue filtered therefrom is termed yellow. These latter colors, cyan, magenta and yellow, are sometimes termed subtractive primary colors, since they denote the absence of one of the primary colors.
Filters selectively attenuate (or "absorb") light of certain colors and pass light of other colors relatively unattenuated. A red filter, for example, attenuates blue and green light and lets red light pass. Similarly, a blue filter attenuates red and green light and lets blue light pass. Finally, a green filter attenuates red and blue light and lets green light pass. Filters of the primary colors thus subtract two primary colors and let the third pass.
Filters of the subtractive primary colors subtract one primary color and let the two others pass. For example, a cyan filter attenuates red light and lets blue and green light pass. Similarly, a magenta filter attenuates green light and lets blue and red light pass. Finally, a yellow filter attenuates blue light and lets green and red light pass.
These properties are summarized in Table I.
TABLE I______________________________________Filter Absorbs Passes______________________________________Red Green, Blue RedGreen Red, Blue GreenBlue Red, Green BlueYellow Blue Green, RedCyan Red Blue, GreenMagenta Green Blue, Red______________________________________
Again, although somewhat counter-intuitive, it should be remembered that a blue filter does not filter out blue light. It passes blue light and blocks light of other colors.
It should further be noted that the human eye is more sensitive to certain wavelengths of light than to others. The eye's response (termed "photopic" response) typically peaks at about 554 nanometers and diminishes to near negligible values around 400 and 700 nanometers.
For convenience of discussion, the optical spectrum is generally segregated into the red, green and blue portions by dividing lines at 500 and 600 nanometers. (For physiological reasons, a precise dividing line cannot be defined.) Using these boundaries, the human eye perceives 55% of the energy in white light from the green portion of the spectrum (500 to 600 nm.), 30% from the red portion (above 600 nm.), and only 15% from the blue portion (below 500 nm.). Perfect green, red and blue filters thus transmit 55%, 30% and 15% of white light, respectively (photopically). Since yellow, cyan and magenta are combinations of these colors, it can be seen that yellow, cyan and magenta filters transmit 85%, 70% and 45% of white light, respectively.
Referring now to FIG. 1, a display device, or subassembly, 10 according to one embodiment of the present invention includes a color mosaic filter 12, two color LCD panels 14, 16, and three polarizers 18, 20, 22.
Panels 14, 16 used in the illustrated embodiment are supertwisted nematic LCD panels that are controllably colored by exploitation of the birefringence effect. The use of birefringence to control color in LCD panels is discussed in U.S. Pat. Nos. 3,876,287, 4,097,128, 4,127,322, 4,394,069, 4,759,612 and 4,786,146, the disclosures of which are incorporated by reference. Briefly, in birefringence color systems, light of different wavelengths is rotated differing amounts as it passes through the liquid crystal material. When the exiting light is analyzed by a polarizer, certain color components are oriented in a direction that passes through the polarizer, and other color components are oriented in directions that are attenuated or blocked. This selective filtering of the optical spectrum by the cooperating polarizers produces the color effect.
In the illustrated embodiment, the birefringent properties of the first panel 14 are "tuned" (by choosing the thickness (d) of the liquid crystal layer and its optical refractive index anistropy (Δn)) to rotate the polarization of incoming red and green light to a direction in which it is absorbed by the exiting polarizer when the panel is in its deselected (i.e. deenergized) state. The panel 14 and polarizers 18 and 20 thus act as a blue filter when the panel is deselected. When the panel is in its selected (i.e. energized) state, the liquid crystal molecules nearly align with the electric field, thereby reducing the effect of the twist so that all wavelengths of light pass through nearly unaffected, i.e. still white. (For expository convenience, panel 14 is sometimes called the "blue" panel and is said to controllably absorb red and green [i.e. yellow] light. It will be recognized, however, that this and panel 16 must be operated in conjunction with associated front and back polarizers to achieve the desired coloring effect.)
The illustrated second panel 16 is similarly tuned to operate as a yellow filter (i.e. absorbing blue) when in its deselected state and to pass all wavelengths of light (i.e. white light) when in its selected state. It is sometimes termed the "yellow" panel.
It may be noted that, unlike most prior art stacked panel displays, the illustrated embodiment includes one panel of a primary color (i.e. blue) and one panel of a subtractive primary color (i.e. yellow). Their cooperative relationship to yield a full color display is made possible by the color mosaic filter 12, as described below.
In the illustrated embodiment, the yellow panel 16 includes a plurality of individually controllable pixels regularly arrayed in a 640 by 480 matrix. (In FIG. 1, each pixel is illustrated by the pair of electrodes 24 that defines it.) The blue panel 14 includes twice as many pixels, arrayed in a 1280 by 480 matrix. The blue panel is cooperatively positioned with the yellow panel so that each pixel of the yellow panel is optically superimposed on two pixels of the blue panel.
The color mosaic filter 12 is comprised of a plurality of cyan and magenta filter elements, 26, 28 respectively, regularly arrayed in a 1280 by 480 matrix. The color mosaic filter is similarly cooperatively positioned with the blue and yellow panels 14, 16 so that each pixel of the filter is optically superimposed on one pixel of the blue panel, and each pair of pixels in the filter is optically superimposed on one pixel in the yellow panel. The above-described superimposition relationship is illustrated in FIG. 2.
The color mosaic filter 12 may be implemented in a number of ways. For example, it may comprise a dyed acetate or polyester substrate, aligned during fabrication with the other layers, or it may comprise the surface of one of the polarizer plates on which filter dyes are offset or screen printed.
The fabrication of color mosaic filters is more particularly detailed, inter alia, in U.S. Pat. Nos. 4,712,874, 4,770,525, 4,776,671, 4,773,737, 4,752,771, 4,690,511, 4,458,175 and 4,653,862, the disclosures of which are incorporated herein by reference.
In operation, all light passing through the display follows one of two different paths 30 or 32 (FIG. 1). The first path 30 is through a cyan filter element 26, the blue panel 14 and the yellow panel 16. The second path 32 is similar but starts with passage through a magenta filter element 28 and concludes by passing through the blue panel and the yellow panel.
Light following the first path 30 is first stripped of its red component (since the cyan mosaic filter element 26 attenuates red light). The remaining blue and green light next passes through the blue panel 14. If this panel is in its deselected state, it acts as a blue filter, passing only blue light. If this panel is in its selected state, it passes both the blue and green light.
The light exiting the blue panel 14 then enters the yellow panel 16. If the yellow panel is in its deselected state, it attenuates blue light, so passes no light if the blue panel was deselected, and passes only green light if the blue panel was selected. If the yellow panel is in its selected state, it passes all light, so passes blue light if the blue panel was deselected, and passes blue and green light (i.e. cyan light) if the blue panel was selected.
Light following the second path 32 is first stripped of its green component (since the magenta mosaic filter element 28 attenuates green light). The remaining red and blue light next passes through the blue panel 14. If this panel is in its deselected state, it acts as a blue filter, passing only blue light. If this panel is in its selected state, it passes both the blue and red light.
The light exiting the blue panel 14 then enter the yellow panel 16. If this yellow panel is in its deselected state, it attenuates blue light, so passes no light if the blue panel was deselected, and passes only red light if the blue panel was selected. If the yellow panel is in its selected state, it passes all light, so passes blue light if the blue panel was deselected, and passes blue and red light (magenta) if the blue panel was selected.
The colors resulting from these various combinations are illustrated in FIG. 3.
Each of the two paths 30, 32 can produce the colors black and blue. The double passage of blue is advantageous because most incandescent illumination has relatively less blue energy than energy of other colors. Thus, the passage of blue light through both paths acts to correct a color imbalance normally inherent with incandescent lighting. In particular, tungsten "white" or 3200° K is color corrected by this arrangement to 5600° K.
Neither of the paths 30 or 32 by themselves can produce yellow or white. However, the human eye can average adjoining cyan and magenta pixels to perceive white, and can average adjoining green and red pixels to perceive yellow. The average of the colors of two adjoining pixels is termed the color of a "super pixel," of which there are 640 across the width of the display. This arrangement thus can yield the full gamut of color.
Table II summarizes the foregoing discussion:
TABLE II______________________________________After After AfterFilter Blue YellowElement Panel Panel Average______________________________________C C (wh) C (wh) WhM M (wh) M (wh)C C (wh) G (yel) YM M (wh) R (yel)C C (wh) C (wh) CM B (b) B (wh)C C (wh) G (yel) GM B (b) Blk (yel)C B (b) B (wh) MM M (wh) M (wh)C B (b) Blk (yel) RM M (wh) R (yel)C B (b) B (wh) BM B (b) B (wh)C B (b) Blk (yel) BlkM B (b) Blk (yel)______________________________________
where B is blue, Blk is black, C is cyan, G is green, M is magenta, R is red, W is white and Y is yellow, and the colors in parentheses indicate whether a panel pixel is in its while (selected) or colored (deselected) states.
The polarizers 18, 20, 22 used in the illustrated embodiment are needed to analyze the light passing through the liquid crystal panels 14, 16 in order to achieve perceptible contrast. In prior art display systems, the polarizers are usually neutral (i.e., dyed black by iodine). In the present invention, colored polarizers (which are "leaky") can be used in certain positions to pass more light, improving the brightness and allowing color balance improvements.
Panel 14 is illustrated as being blue when in its deselected state. Light entering it is polarized by an entrance polarizer 18. Normally, all colors of light orthogonal to the axis of polarizer 18 would be absorbed by the black dye of a conventional, neutral polarizer, resulting in an immediate loss of 50% of the light. This loss can be cut dramatically if the polarizer 18 is dyed blue. Such a polarizer still passes the white light parallel to the polarizer's axis, but additionally passes blue light orthogonal to its axis. This additional blue light is permitted to pass to the yellow panel 16 and ultimately contributes to the overall brightness of the resulting display, instead of being absorbed by the first polarizer as is normally the case. The losses normally associated with this first polarizer are thus cut by a third (radiometrically). Display brightness improves commensurately.
The same benefit can be achieved at the exiting end of the stacked assembly 10. Panel 16 is illustrated as being yellow in its deselected state. By dying the polarizer 22 adjacent thereto yellow, the red and green light that would normally be absorbed thereby is allowed to leak through, again improving display brightness.
In addition to the foregoing benefits, colored polarizers also ease the design requirements of the LCDs with which they are associated. While an LCD designer must normally be concerned about the performance of a panel across the entire spectrum, the use of a colored polarizer with the panel renders the performance at certain colors irrelevant. For example, in designing the blue panel 14, the designer need not worry about its performance in the selected and deselected states in the blue portion of the spectrum. The blue polarizer 18 will cause the panel to pass blue regardless of its state, so the designer can focus on optimizing performance in the green and red portions of the spectrum. Similarly with the yellow polarizer 22. Since this polarizer will cause the yellow panel 16 to pass green and red light regardless of its state, the designer can focus on optimizing performance of the panel in the blue portion of the spectrum.
Spectrophotometer plots showing the ideal and actual light transmission qualities of panels 14 and 16 (again, considered in conjunction with their associated polarizers) are provided in FIGS. 4 and 5, respectively. Panels suitable for use as panels 14, 16 are available from Kyocera of Kyoto, Japan or may be fabricated using known techniques.
Spectrophotometer plots showing the ideal and actual light transmission qualities of cyan and magenta filter elements 26, 28 are provided in FIGS. 6 and 7. Suitable filter materials or dyes are available from Crompton & Knowles, Brewer Science, Kodak Wratten, and Lee Colortran International.
As can be seen from the foregoing curves, neither the passage of light of the desired colors nor the attenuation of light of undesired colors is perfect in the actual panels and filters. However, the resulting effect is more than adequate to provide saturated colors throughout the human visual area. A chromaticity diagram illustrating the color gamut resulting from these imperfect elements (using color illumination) is shown in FIG. 8.
The foregoing discussion has described only one of many possible combinations of panel colors and mosaic filter colors. Others can readily be devised. Generally speaking, the preferred embodiments are characterized as follows:
the first panel has 2N pixels that pass either all colors, or only primary color C;
the second panel has N pixels that pass either all colors, or only a color subtractive primary (A+B);
the color mosaic filter has N pixels that pass the color subtractive primary (A+C), and N more pixels that pass the color subtractive primary (B+C); (where A, B and C are assigned from the primary colors red, green and blue).
Thus, other embodiments include one in which the filter elements are colored magenta and yellow, and the panels are colored red and cyan; and a second in which the filter elements are colored cyan and yellow, and the panels are colored green and magenta.
One advantage of the present invention is this flexibility it offers in possible arrangements. If one of these embodiments seems unworkable, a design can be optimized about another one. For example, if it is found that a suitable cyan filter cannot be obtained, then a design that does not require a cyan filter can be adopted instead.
As noted earlier, the illustrated embodiment is advantageous due to the color correction it offers with incandescent light. However, these other embodiments have their own advantages. The embodiment with magenta and yellow filter elements, for example, can advantageously be used to color compensate fluorescent light, which is typically weak in the red portion of the spectrum.
Referring now to FIG. 9, in a first application 34 of the present invention, the display subassembly 10 is positioned on the transparent projection surface 36 of a conventional overhead projector 38. Such projectors typically include an illumination bulb 40 and a Fresnel lens 42 under the projection surface to produce light beams that pass through a transparency and converge onto a projection lens assembly 44. (Due to the short focal length and high power required of lens 42, this lens is often formed by cementing two or more lower powered Fresnel lenses together.)
When display subassembly 10 is used in the FIG. 9 application, it is desirable to provide a Fresnel lens 46 to collimate the converging light from the projection surface prior to illumination of the display subassembly. The light exiting the subassembly is then refocused by a lens 48 (which is also desirably in Fresnel form) onto the projection lens assembly 44. (Lens 48 here serves the same purpose as the Fresnel lens provided under the projection surface of the projector in the projector's normal operation, namely to focus light towards the projection lens assembly 44.)
In another embodiment, no auxiliary Fresnel lenses are used. Instead, the pixels on the various layers of the display subassembly 10 are spaced with different pitches so that the pixels align in proper registration with the converging light from the projector's built-in Fresnel lenses 44. This arrangement of pixels is shown in FIG. 1.
A second application 50 of the display assembly of the present invention is as a backlit screen for a computer or the like. In this application, shown in FIG. 10, the assembly 10 is illuminated with collimated light, and a translucent light dispersing material 52, such as a ground glass plate or a commercially available diffusion material (i.e. Rolux film manufactured by Rosco of Port Chester N.Y.) is mounted adjacent the yellow polarizer 22 to display the resulting color image. The collimated excitation light can be provided from a relatively low wattage bulb 54 in conjunction with a thin lens 56.
In a related embodiment 50', shown in FIG. 11, a direct view display may be illuminated by a fluorescent light panel 57. In such embodiment, the display subassembly 10 is fabricated with an entrance plate 58 on which are formed a plurality of microlenses 60, one aligned to each pixel. Light incident on one of microlenses 60, regardless of its orientation, is directed normal to the plane of the display subassembly 10 and thus passes through the pixels of the component layers in the proper alignment.
The same arrangement may be used on the exiting side of the display. In this case, collimated light exiting the subassembly 10 is dispersed by microlenses 62 which permit the color image to be viewed from a wide range of angles without parallax effects. The interstitial areas 64 between the lenses may be colored black to minimize stray light and to improve perceived contrast. Alternatively, a simple light dispersing medium such as the ground glass plate 52 shown in FIG. 10 can be used.
In still a further variation 50" of the direct view application of FIG. 10, the light can be collimated by a novel arrangement employing a parabolic mirror 66 (desirably in Fresnel form) and a micro-venetian blind material 68. As shown in FIG. 12, this embodiment is illuminated by a pair of linear light sources, such as fluorescent bulbs 70. These bulbs illuminate a generally flat mirrored surface 72 that has facets arranged to provide one axis of collimation. The angles of the facets vary with placement on the surface to simulate a sectioned parabolic reflector. Light reflected from this mirrored surface is substantially collimated. However, to remove any stray off-axis light, a micro-venetian blind material 68, such as Light Control Film marketed by 3M Corp, is desirably placed between the mirror and the display subassembly. This material is a thin plastic film containing closely spaced black microlouvers to absorb light misaligned with respect to the louvers. By this arrangement, a very compact and efficient display can be provided.
From the foregoing description, it will be recognized that the present invention solves many of the problems and deficiencies associated with prior art color display technologies. In addition to addressing the parallax and brightness problems noted earlier, the present invention offers a number of other advantages. One is the color compensation that corrects for the excessive red energy output from incandescent illumination sources. Another is a simplification that can be made in the display's drive circuitry due to the fact that the blue panel requires data at only twice the nominal shift clock frequency, instead of three-times as required with conventional three color filter displays. This 2X relation is easier to implement in digital logic than the 3X required in the prior art. Furthermore, the mosaic color filter can be fabricated independently of the polarizers and the panels, permitting its independent optimization. Its use of only two colors reduces the area on the filter dedicated to a black matrix that typically separates the constituent filter pixels, further increasing display brightness. Finally, the blue and yellow panels used in the illustrated embodiment are well developed designs that are based on well understood technology.
Having described and illustrated the principles of my invention with reference to a preferred embodiment and several variations thereon, it should be apparent that the invention can be modified in arrangement and detail without departing from such principles. For example, while the display subassembly has been described as including single supertwisted liquid crystal panels, other types, such as double supertwisted panels or panels embodying other technologies, can alternatively be used. Similarly, while the color mosaic filter has been described as comprising a plurality of pixels, in other embodiments a conventional color stripe arrangement may be used instead. Similarly, while the display subassembly has been described as including three polarizers, two LCD panels and one color mosaic filter, in other embodiments of the invention, additional optical components can also be used. For example, it is sometimes desirable to include retardation films adjacent the panels in order to tune the range of birefringence effects to desired frequencies. In other embodiments, if any of the LCD birefringence colors are not ideal, some attenuation of specific light frequencies might enhance the color gamut and overall contrast. Thus, two polarizers might be used together or a weak color filter compensator (i.e. a conventional gelatin filter) might be added.
Still further, while the illustrated embodiment has shown a system in which entering light can pass through two distinct light paths within a single display subassembly, in alternative embodiments these two light paths can be defined by two separate assemblies. For example, a color projection system may comprise first and second projectors, with the first using a display subassembly having a solid magenta filter, a blue panel and a yellow panel; and the second using a display subassembly having a solid cyan filter, a blue panel and a yellow panel. The images from these two projectors can be superimposed and projected onto a common screen.
In view of these and the wide variety of other embodiments to which the principles of my invention may be applied, it should be recognized that the illustrated embodiments are to be considered illustrative only and not as limiting the scope of the invention. Instead, I claim as my invention all such modifications as may come within the scope and spirit of the following claims and equivalents thereto.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US4006968 *||May 2, 1975||Feb 8, 1977||Hughes Aircraft Company||Liquid crystal dot color display|
|US4257682 *||Feb 21, 1978||Mar 24, 1981||Citizen Watch Co., Ltd.||Liquid crystal color display cell|
|US4416514 *||Nov 10, 1980||Nov 22, 1983||Polaroid Corporation||Color filter|
|US4597636 *||Dec 27, 1983||Jul 1, 1986||Seiko Epson Corporation||Liquid crystal display panel and a process for the production thereof|
|US4610507 *||May 15, 1984||Sep 9, 1986||Seiko Instruments & Electronics Ltd.||Color liquid crystal display device having multicolor polarizers|
|US4651148 *||Sep 6, 1984||Mar 17, 1987||Sharp Kabushiki Kaisha||Liquid crystal display driving with switching transistors|
|US4798441 *||Mar 9, 1987||Jan 17, 1989||Itt Corporation||Fiber optic device coupling|
|US4838655 *||Jan 6, 1988||Jun 13, 1989||Hitachi, Ltd.||Projector using guest-host liquid crystal cells for improved color purity|
|US4842379 *||Nov 13, 1987||Jun 27, 1989||Fuji Photo Film Co., Ltd.||Image recording apparatus utilizing an ECB mode liquid crystal|
|US4859037 *||Nov 5, 1987||Aug 22, 1989||Seiko Epson Corporation||Liquid crystal electrically-controlled birefringence display devices with improved contrast|
|US4877309 *||Dec 8, 1987||Oct 31, 1989||Sharp Kabushiki Kaisha||Color liquid crystal display unit|
|GB2024443A *||Title not available|
|JPS5355049A *||Title not available|
|JPS5459162A *||Title not available|
|JPS6349736A *||Title not available|
|JPS6444417A *||Title not available|
|JPS50110296A *||Title not available|
|JPS50110297A *||Title not available|
|JPS55159415A *||Title not available|
|JPS56121076A *||Title not available|
|JPS56140320A *||Title not available|
|JPS58224376A *||Title not available|
|JPS59189317A *||Title not available|
|JPS59219719A *||Title not available|
|JPS60194426A *||Title not available|
|JPS60238815A *||Title not available|
|JPS61100725A *||Title not available|
|JPS62125328A *||Title not available|
|JPS62164024A *||Title not available|
|JPS63144326A *||Title not available|
|JPS63195624A *||Title not available|
|JPS63234225A *||Title not available|
|JPS63264731A *||Title not available|
|JPS63286819A *||Title not available|
|1||Assouline et al., "Two-Color Liquid-Crystal Display," Electronics Letters, Nov. 18, 1971, vol. 7, No. 23, pp. 699-700.|
|2||*||Assouline et al., Two Color Liquid Crystal Display, Electronics Letters, Nov. 18, 1971, vol. 7, No. 23, pp. 699 700.|
|3||Heilmeier et al., "Guest-Host Interactions in Nematic Liquid Crystals, A New Electro-Optic Effect," Applied Physics Letters, Aug. 1, 1968, vol. 13, No. 3, pp. 91-92.|
|4||*||Heilmeier et al., Guest Host Interactions in Nematic Liquid Crystals, A New Electro Optic Effect, Applied Physics Letters, Aug. 1, 1968, vol. 13, No. 3, pp. 91 92.|
|5||IBM Corp., "Twisted Nematic Liquid Crystal Replacement for Overhead Transparency", IBM, vol. 29, No. 11, Apr. 1987.|
|6||*||IBM Corp., Twisted Nematic Liquid Crystal Replacement for Overhead Transparency , IBM, vol. 29, No. 11, Apr. 1987.|
|7||Iijima, et al., "640×400 Pixels Multicolor STN-LCD Using Birefringence Effect," Japan Display '89, pp. 300-302.|
|8||*||Iijima, et al., 640 400 Pixels Multicolor STN LCD Using Birefringence Effect, Japan Display 89, pp. 300 302.|
|9||Kawachi, et al., "Light Scatteering Chara cteristics in Nematic-Cholesteric Mixtures with Positive Dielectric Anisotropy", Japan Journal of Appl. Phy., vol. 17, No. 7, Jul., '78, pp. 1245-1250.|
|10||*||Kawachi, et al., Light Scatteering Chara cteristics in Nematic Cholesteric Mixtures with Positive Dielectric Anisotropy , Japan Journal of Appl. Phy., vol. 17, No. 7, Jul., 78, pp. 1245 1250.|
|11||Kotani, et al., "Effect of Various Parameters on Matrix Display of SBE-Liquid Crystal Cells," Japan Display '86, pp. 384-386.|
|12||*||Kotani, et al., Effect of Various Parameters on Matrix Display of SBE Liquid Crystal Cells, Japan Display 86, pp. 384 386.|
|13||Mochizuki, et al., "New Nematic-Cholesteric LCD Using Hysteresis Behavior," Proceedings of the SID, 1985, vol. 26/4, pp. 243-248.|
|14||*||Mochizuki, et al., New Nematic Cholesteric LCD Using Hysteresis Behavior, Proceedings of the SID, 1985, vol. 26/4, pp. 243 248.|
|15||Sato, et al., "Novel Multicolor Liquid Crystal Display Without Color Filter," Japan Display '89, pp. 392-395.|
|16||*||Sato, et al., Novel Multicolor Liquid Crystal Display Without Color Filter, Japan Display 89, pp. 392 395.|
|17||Scheffer, Terry, "New Multicolor Liuid Crystal Displays That Use a Twisted Nematic Electo-Optical Cell," Journal of Applied Physics, vol. 44, No. 11, Nov., 1973, pp. 4799-4803.|
|18||*||Scheffer, Terry, New Multicolor Liuid Crystal Displays That Use a Twisted Nematic Electo Optical Cell, Journal of Applied Physics, vol. 44, No. 11, Nov., 1973, pp. 4799 4803.|
|19||Schickel, et al., "Deformation of Nematic Liquid Crystals With Vertical Orientation in Electrical Fields," Applied Physics Letters, vol. 19, No. 10, Nov. 15, 1971, pp. 391-393.|
|20||*||Schickel, et al., Deformation of Nematic Liquid Crystals With Vertical Orientation in Electrical Fields, Applied Physics Letters, vol. 19, No. 10, Nov. 15, 1971, pp. 391 393.|
|21||Uchida et al., "Bright Dichroic Guest-Host LCDs Without a Polarizer," Proceedings of the SID, vol. 22/1, 1981, pp. 41-46.|
|22||*||Uchida et al., Bright Dichroic Guest Host LCDs Without a Polarizer, Proceedings of the SID, vol. 22/1, 1981, pp. 41 46.|
|23||Uchida, T., "Multicolored Liquid Crystal Displays," Optical Engineering, May/Jun. 1984, vol. 23, No. 3, pp. 247-252.|
|24||*||Uchida, T., Multicolored Liquid Crystal Displays, Optical Engineering, May/Jun. 1984, vol. 23, No. 3, pp. 247 252.|
|25||White et al., "New Absorptive Mode Reflective Liquid-Crystal Display Device," Journal of Applied Physics, vol. 45, No. 11, Nov., 1974, pp. 4718-4723.|
|26||*||White et al., New Absorptive Mode Reflective Liquid Crystal Display Device, Journal of Applied Physics, vol. 45, No. 11, Nov., 1974, pp. 4718 4723.|
|27||Yamagishi, et al., "A Multi-Colored Projection Display Using Nematic-Cholesteric Liquid Crystal," 1988 IEEE, pp. 204-207.|
|28||*||Yamagishi, et al., A Multi Colored Projection Display Using Nematic Cholesteric Liquid Crystal, 1988 IEEE, pp. 204 207.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5179459 *||Jun 28, 1991||Jan 12, 1993||Compag Computer Corporation||Methods for adhering multiple stack liquid crystal display panels|
|US5299039 *||Mar 8, 1991||Mar 29, 1994||Proxima Corporation||Stacked display panel construction and method of aligning pixel elements thereof|
|US5371618 *||Jan 5, 1993||Dec 6, 1994||Brite View Technologies||Color liquid crystal display employing dual cells driven with an EXCLUSIVE OR relationship|
|US5422756 *||May 18, 1992||Jun 6, 1995||Minnesota Mining And Manufacturing Company||Backlighting system using a retroreflecting polarizer|
|US5526145 *||Jun 10, 1994||Jun 11, 1996||E. I. Du Pont De Nemours And Company||Color tuned holographic optical elements and methods of making and using the elements|
|US5559634 *||Oct 26, 1994||Sep 24, 1996||Minnesota Mining And Manufacturing Company||Retroreflecting polarizer|
|US5574580 *||Dec 12, 1995||Nov 12, 1996||Hughes Aircraft Company||LCD with integral light confinement having a pair of afocal lenslets positioned between liquid crystal cells and color polarizers|
|US5671031 *||Aug 27, 1996||Sep 23, 1997||Sharp Kabushiki Kaisha||Reflection type liquid crystal display device and personal digital equipment using the same|
|US5682180 *||Jun 8, 1990||Oct 28, 1997||General Motors Corporation||Multi-color electronic display utilizing opponent colors|
|US5737115 *||Dec 15, 1995||Apr 7, 1998||Xerox Corporation||Additive color tristate light valve twisting ball display|
|US5751384 *||May 23, 1995||May 12, 1998||The Board Of Regents Of The University Of Colorado||Color polarizers for polarizing an additive color spectrum along a first axis and it's compliment along a second axis|
|US5760851 *||Nov 28, 1994||Jun 2, 1998||Smartlight Ltd.||Display device|
|US5767826 *||Dec 15, 1995||Jun 16, 1998||Xerox Corporation||Subtractive color twisting ball display|
|US5790216 *||Nov 28, 1994||Aug 4, 1998||Smartlight Ltd.||Viewing apparatus and work station|
|US5835166 *||Sep 16, 1996||Nov 10, 1998||Hall; Dennis R.||Chiral nematic liquid crystal polarization modulated color display for stereoscopic viewing device|
|US5835173 *||May 28, 1996||Nov 10, 1998||Smartlight Ltd||Transparency viewing device comprising passive matrix LCD|
|US5841492 *||Nov 2, 1995||Nov 24, 1998||Sharp Kabushiki Kaisha||Liquid crystal display device|
|US5859676 *||May 28, 1996||Jan 12, 1999||Smartlight Ltd.||Self-masking viewing apparatus|
|US5890305 *||May 15, 1997||Apr 6, 1999||Smartlight Ltd.||Self-masking transparency viewing apparatus|
|US5929946 *||May 9, 1997||Jul 27, 1999||Colorlink, Inc.||Retarder stack for preconditioning light for a modulator having modulation and isotropic states of polarization|
|US5930011 *||Sep 17, 1996||Jul 27, 1999||E. I. Du Pont De Nemours And Company||Holographic Multicolor optical elements for use in liquid crystal displays and methods of making the elements|
|US5953083 *||May 8, 1997||Sep 14, 1999||Colorlink, Inc.||Retarder stacks for polarizing a first color spectrum along a first axis and a second color spectrum along a second axis|
|US5963276 *||Jan 9, 1997||Oct 5, 1999||Smartlight Ltd.||Back projection transparency viewer with overlapping pixels|
|US5982346 *||Dec 15, 1995||Nov 9, 1999||Xerox Corporation||Fabrication of a twisting ball display having two or more different kinds of balls|
|US5990996 *||May 9, 1997||Nov 23, 1999||Colorlink, Inc.||Color selective light modulators employing birefringent stacks|
|US5999240 *||May 9, 1997||Dec 7, 1999||Colorlink, Inc.||Optical retarder stack pair for transforming input light into polarization states having saturated color spectra|
|US6049367 *||May 9, 1997||Apr 11, 2000||Colorlink, Inc.||Polarization manipulating device modulator with retarder stack which preconditions light for modulation and isotropic states|
|US6183091||May 14, 1999||Feb 6, 2001||Colorlink, Inc.||Color imaging systems and methods|
|US6204899||Aug 20, 1998||Mar 20, 2001||Dennis R. Hall||High efficiency, color coding light pipe methods for display applications, utilizing chiral liquid crystal materials|
|US6252638||Nov 13, 1998||Jun 26, 2001||Colorlink, Inc.||Color controllable illumination device, indicator lights, transmissive windows and color filters employing retarder stacks|
|US6273571||Oct 1, 1999||Aug 14, 2001||Colorlink, Inc.||Display architectures using an electronically controlled optical retarder stack|
|US6279253||Jan 28, 1999||Aug 28, 2001||Smartlight Ltd.||Self-masking transparency viewing apparatus|
|US6310673||Jul 30, 1999||Oct 30, 2001||University Technology Corporation||Transmissive optical polarizing filters designed to maximize a desired portion of a spectral output|
|US6311419||Dec 4, 1996||Nov 6, 2001||Smartlight Ltd.||Dedicated mammogram viewer|
|US6417863 *||Aug 15, 2000||Jul 9, 2002||Intel Corporation||Color balancing a multicolor display|
|US6417892||Jul 30, 1999||Jul 9, 2002||Colorlink, Inc.||Color filters, sequencers and displays using color selective light modulators|
|US6452646||Feb 2, 1999||Sep 17, 2002||Colorlink, Inc.||Optical retarder stack formed of multiple retarder sheets|
|US6665026 *||May 29, 2001||Dec 16, 2003||Sung-Pen Lin||Liquid crystal display|
|US6667784||Mar 19, 2002||Dec 23, 2003||Colorlink, Inc.||Color filters, sequencers and displays using color selective light modulators|
|US6707516||Oct 2, 1998||Mar 16, 2004||Colorlink, Inc.||Single-panel field-sequential color display systems|
|US6724354 *||May 30, 2000||Apr 20, 2004||The Microoptical Corporation||Illumination systems for eyeglass and facemask display systems|
|US6817717||Sep 19, 2002||Nov 16, 2004||Hewlett-Packard Development Company, L.P.||Display system with low and high resolution modulators|
|US6882384||Jul 31, 1998||Apr 19, 2005||Colorlink, Inc.||Color filters and sequencers using color selective light modulators|
|US6899430||Dec 15, 2000||May 31, 2005||Colorlink, Inc.||Color imaging systems and methods|
|US6903754||Jul 25, 2001||Jun 7, 2005||Clairvoyante, Inc||Arrangement of color pixels for full color imaging devices with simplified addressing|
|US6917368||Mar 4, 2003||Jul 12, 2005||Clairvoyante, Inc.||Sub-pixel rendering system and method for improved display viewing angles|
|US6920000||Sep 19, 2002||Jul 19, 2005||Hewlett-Packard Development Company, L.P.||Filter for a display system|
|US6921175||Sep 19, 2002||Jul 26, 2005||Hewlett-Packard Development Company, L.P.||Color-generating device and display system|
|US6950115||Dec 14, 2001||Sep 27, 2005||Clairvoyante, Inc.||Color flat panel display sub-pixel arrangements and layouts|
|US7018046||Sep 15, 2004||Mar 28, 2006||Hewlett-Packard Development Company, L.P.||Display system with low and high resolution modulators|
|US7046256||Jan 22, 2003||May 16, 2006||Clairvoyante, Inc||System and methods of subpixel rendering implemented on display panels|
|US7084923||Oct 28, 2003||Aug 1, 2006||Clairvoyante, Inc||Display system having improved multiple modes for displaying image data from multiple input source formats|
|US7123277||Jan 16, 2002||Oct 17, 2006||Clairvoyante, Inc.||Conversion of a sub-pixel format data to another sub-pixel data format|
|US7158096||Jun 7, 2000||Jan 2, 2007||The Microoptical Corporation||Compact, head-mountable display device with suspended eyepiece assembly|
|US7167186||Mar 4, 2003||Jan 23, 2007||Clairvoyante, Inc||Systems and methods for motion adaptive filtering|
|US7184066||Aug 8, 2002||Feb 27, 2007||Clairvoyante, Inc||Methods and systems for sub-pixel rendering with adaptive filtering|
|US7221381||May 17, 2002||May 22, 2007||Clairvoyante, Inc||Methods and systems for sub-pixel rendering with gamma adjustment|
|US7230584||May 20, 2003||Jun 12, 2007||Clairvoyante, Inc||Projector systems with reduced flicker|
|US7248271||Jan 31, 2005||Jul 24, 2007||Clairvoyante, Inc||Sub-pixel rendering system and method for improved display viewing angles|
|US7268748||May 20, 2003||Sep 11, 2007||Clairvoyante, Inc||Subpixel rendering for cathode ray tube devices|
|US7274383||Jul 28, 2000||Sep 25, 2007||Clairvoyante, Inc||Arrangement of color pixels for full color imaging devices with simplified addressing|
|US7283142||Oct 22, 2002||Oct 16, 2007||Clairvoyante, Inc.||Color display having horizontal sub-pixel arrangements and layouts|
|US7283181||Mar 14, 2003||Oct 16, 2007||Hewlett-Packard Development Company, L.P.||Selectable color adjustment for image display|
|US7352374||Apr 7, 2003||Apr 1, 2008||Clairvoyante, Inc||Image data set with embedded pre-subpixel rendered image|
|US7391475||Mar 14, 2003||Jun 24, 2008||Hewlett-Packard Development Company, L.P.||Display image generation with differential illumination|
|US7414595||Dec 7, 2003||Aug 19, 2008||Advanced Simulation Displays Co.||Virtual mosaic wide field of view display system|
|US7417648||Oct 22, 2002||Aug 26, 2008||Samsung Electronics Co. Ltd.,||Color flat panel display sub-pixel arrangements and layouts for sub-pixel rendering with split blue sub-pixels|
|US7460179||Mar 14, 2003||Dec 2, 2008||Hewlett-Packard Development Company, L.P.||Adaptive image display|
|US7492379||Oct 22, 2002||Feb 17, 2009||Samsung Electronics Co., Ltd.||Color flat panel display sub-pixel arrangements and layouts for sub-pixel rendering with increased modulation transfer function response|
|US7511787||Oct 22, 2004||Mar 31, 2009||Real D||Color filters and sequencers using color-selective light modulators|
|US7525526||Oct 28, 2003||Apr 28, 2009||Samsung Electronics Co., Ltd.||System and method for performing image reconstruction and subpixel rendering to effect scaling for multi-mode display|
|US7573493||Aug 31, 2006||Aug 11, 2009||Samsung Electronics Co., Ltd.||Four color arrangements of emitters for subpixel rendering|
|US7590299||Jun 10, 2004||Sep 15, 2009||Samsung Electronics Co., Ltd.||Increasing gamma accuracy in quantized systems|
|US7598963||Oct 13, 2006||Oct 6, 2009||Samsung Electronics Co., Ltd.||Operating sub-pixel rendering filters in a display system|
|US7623141||May 11, 2007||Nov 24, 2009||Samsung Electronics Co., Ltd.||Methods and systems for sub-pixel rendering with gamma adjustment|
|US7643107 *||May 1, 2007||Jan 5, 2010||Citizen Holdings Co., Ltd.||Liquid crystal display apparatus|
|US7646398||Jul 14, 2005||Jan 12, 2010||Samsung Electronics Co., Ltd.||Arrangement of color pixels for full color imaging devices with simplified addressing|
|US7646430||Jun 28, 2006||Jan 12, 2010||Samsung Electronics Co., Ltd.||Display system having improved multiple modes for displaying image data from multiple input source formats|
|US7688335||Oct 11, 2006||Mar 30, 2010||Samsung Electronics Co., Ltd.||Conversion of a sub-pixel format data to another sub-pixel data format|
|US7689058||Oct 13, 2006||Mar 30, 2010||Samsung Electronics Co., Ltd.||Conversion of a sub-pixel format data to another sub-pixel data format|
|US7701476||Aug 31, 2006||Apr 20, 2010||Samsung Electronics Co., Ltd.||Four color arrangements of emitters for subpixel rendering|
|US7728802||Mar 4, 2005||Jun 1, 2010||Samsung Electronics Co., Ltd.||Arrangements of color pixels for full color imaging devices with simplified addressing|
|US7755648||Jul 14, 2005||Jul 13, 2010||Samsung Electronics Co., Ltd.||Color flat panel display sub-pixel arrangements and layouts|
|US7755649||Apr 2, 2007||Jul 13, 2010||Samsung Electronics Co., Ltd.||Methods and systems for sub-pixel rendering with gamma adjustment|
|US7755652||Aug 30, 2006||Jul 13, 2010||Samsung Electronics Co., Ltd.||Color flat panel display sub-pixel rendering and driver configuration for sub-pixel arrangements with split sub-pixels|
|US7864194||Jan 19, 2007||Jan 4, 2011||Samsung Electronics Co., Ltd.||Systems and methods for motion adaptive filtering|
|US7864202||Oct 13, 2006||Jan 4, 2011||Samsung Electronics Co., Ltd.||Conversion of a sub-pixel format data to another sub-pixel data format|
|US7889215||Oct 16, 2008||Feb 15, 2011||Samsung Electronics Co., Ltd.||Conversion of a sub-pixel format data to another sub-pixel data format|
|US7911487||Oct 13, 2009||Mar 22, 2011||Samsung Electronics Co., Ltd.||Methods and systems for sub-pixel rendering with gamma adjustment|
|US7916156||Feb 11, 2010||Mar 29, 2011||Samsung Electronics Co., Ltd.||Conversion of a sub-pixel format data to another sub-pixel data format|
|US7969456||Feb 26, 2007||Jun 28, 2011||Samsung Electronics Co., Ltd.||Methods and systems for sub-pixel rendering with adaptive filtering|
|US8022969||May 17, 2002||Sep 20, 2011||Samsung Electronics Co., Ltd.||Rotatable display with sub-pixel rendering|
|US8031205||Mar 13, 2008||Oct 4, 2011||Samsung Electronics Co., Ltd.||Image data set with embedded pre-subpixel rendered image|
|US8134583||Aug 11, 2008||Mar 13, 2012||Samsung Electronics Co., Ltd.||To color flat panel display sub-pixel arrangements and layouts for sub-pixel rendering with split blue sub-pixels|
|US8159511||Jun 28, 2010||Apr 17, 2012||Samsung Electronics Co., Ltd.||Methods and systems for sub-pixel rendering with gamma adjustment|
|US8223168||Feb 4, 2011||Jul 17, 2012||Samsung Electronics Co., Ltd.||Conversion of a sub-pixel format data|
|US8294741||Mar 1, 2010||Oct 23, 2012||Samsung Display Co., Ltd.||Four color arrangements of emitters for subpixel rendering|
|US8378947||Aug 7, 2006||Feb 19, 2013||Samsung Display Co., Ltd.||Systems and methods for temporal subpixel rendering of image data|
|US8405692||Apr 11, 2007||Mar 26, 2013||Samsung Display Co., Ltd.||Color flat panel display arrangements and layouts with reduced blue luminance well visibility|
|US8421820||Jun 27, 2011||Apr 16, 2013||Samsung Display Co., Ltd.||Methods and systems for sub-pixel rendering with adaptive filtering|
|US8456496||Mar 12, 2012||Jun 4, 2013||Samsung Display Co., Ltd.||Color flat panel display sub-pixel arrangements and layouts for sub-pixel rendering with split blue sub-pixels|
|US8487850 *||Jun 5, 2000||Jul 16, 2013||Hewlett-Packard Development Company, L.P.||Multi-source LCD backlight for white balance adjustment|
|US8704744||Feb 8, 2013||Apr 22, 2014||Samsung Display Co., Ltd.||Systems and methods for temporal subpixel rendering of image data|
|US8830275||May 17, 2007||Sep 9, 2014||Samsung Display Co., Ltd.||Methods and systems for sub-pixel rendering with gamma adjustment|
|US8993951||Jul 16, 2013||Mar 31, 2015||Magna Electronics Inc.||Driver assistance system for a vehicle|
|US9014966||Mar 14, 2014||Apr 21, 2015||Magna Electronics Inc.||Driver assist system for vehicle|
|US9131120||May 15, 2013||Sep 8, 2015||Magna Electronics Inc.||Multi-camera vision system for a vehicle|
|US9171217||Mar 3, 2014||Oct 27, 2015||Magna Electronics Inc.||Vision system for vehicle|
|US9191634||Apr 3, 2015||Nov 17, 2015||Magna Electronics Inc.||Vision system for vehicle|
|US20010000971 *||Dec 15, 2000||May 10, 2001||Colorlink, Inc.||Color imaging systems and methods|
|US20020186229 *||May 17, 2002||Dec 12, 2002||Brown Elliott Candice Hellen||Rotatable display with sub-pixel rendering|
|US20030090581 *||Oct 22, 2002||May 15, 2003||Credelle Thomas Lloyd||Color display having horizontal sub-pixel arrangements and layouts|
|US20030128179 *||Oct 22, 2002||Jul 10, 2003||Credelle Thomas Lloyd||Color flat panel display sub-pixel arrangements and layouts for sub-pixel rendering with split blue sub-pixels|
|US20030227577 *||Mar 14, 2003||Dec 11, 2003||Allen William J.||Selectable color adjustment for image display|
|US20030231260 *||Mar 14, 2003||Dec 18, 2003||Pate Michael A.||Display image generation with differential illumination|
|US20040008288 *||Mar 14, 2003||Jan 15, 2004||Pate Michael A.||Adaptive image display|
|US20040046714 *||Dec 14, 2001||Mar 11, 2004||Clairvoyante Laboratories, Inc.||Color flat panel display sub-pixel arrangements and layouts|
|US20040051724 *||Sep 13, 2002||Mar 18, 2004||Elliott Candice Hellen Brown||Four color arrangements of emitters for subpixel rendering|
|US20040057021 *||Sep 19, 2002||Mar 25, 2004||Noah Lassar||Color-generating device and display system|
|US20040057143 *||Sep 19, 2002||Mar 25, 2004||Steinfield Steven W.||Filter for a display system|
|US20040174375 *||Mar 4, 2003||Sep 9, 2004||Credelle Thomas Lloyd||Sub-pixel rendering system and method for improved display viewing angles|
|US20040196302 *||Mar 4, 2003||Oct 7, 2004||Im Moon Hwan||Systems and methods for temporal subpixel rendering of image data|
|US20050030482 *||Sep 15, 2004||Feb 10, 2005||Childers Winthrop D.||Display system with low and high resolution modulators|
|US20050122454 *||Oct 22, 2004||Jun 9, 2005||Colorlink, Inc.||Color filters and sequencers using color-selective light modulators|
|US20050134600 *||Jan 31, 2005||Jun 23, 2005||Clairvoyante, Inc.||Sub-pixel rendering system and method for improved display viewing angles|
|US20050248262 *||Jul 14, 2005||Nov 10, 2005||Clairvoyante, Inc||Arrangement of color pixels for full color imaging devices with simplified addressing|
|US20050250821 *||Apr 15, 2005||Nov 10, 2005||Vincent Sewalt||Quaternary ammonium compounds in the treatment of water and as antimicrobial wash|
|US20050264588 *||Jul 14, 2005||Dec 1, 2005||Clairvoyante, Inc||Color flat panel display sub-pixel arrangements and layouts|
|US20070052887 *||Aug 31, 2006||Mar 8, 2007||Clairvoyante, Inc||Four color arrangements of emitters for subpixel rendering|
|US20070057963 *||Aug 31, 2006||Mar 15, 2007||Clairvoyante, Inc.||Four color arrangements of emitters for subpixel rendering|
|US20070296875 *||Sep 6, 2007||Dec 27, 2007||Allen William J||Selectable Color Adjustment for Image Display|
|US20080273145 *||May 1, 2007||Nov 6, 2008||Takashi Akiyama||Liquid crystal display apparatus|
|US20090251405 *||Aug 28, 2007||Oct 8, 2009||Koninklijke Philips Electronics N.V.||Colour reflective display devices|
|US20100149208 *||Feb 11, 2010||Jun 17, 2010||Candice Hellen Brown Elliott||Conversion of a sub-pixel format data to another sub-pixel data format|
|WO1992015918A1 *||Mar 5, 1992||Sep 17, 1992||Proxima Corp||Stacked display panel construction and method of aligning pixel elements thereof|
|WO2002091349A1 *||Apr 22, 2002||Nov 14, 2002||Clairvoyante Lab Inc||Conversion of a sub-pixel format data to another sub-pixel data format|
|U.S. Classification||349/80, 349/6, 349/97|
|International Classification||G02F1/1335, G06F1/20, G02F1/1347, G06F1/16|
|Cooperative Classification||G02F1/13473, G06F1/1613, G06F2200/1612, G06F1/1601, G02F1/133533, G06F1/203|
|European Classification||G06F1/16D, G06F1/20P, G06F1/16P, G02F1/1347A2|
|Jun 7, 1989||AS||Assignment|
Owner name: IN FOCUS SYSTEMS, INC., 7649 S.W. MOHAWK STREET, T
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CONNER, ARLIE R.;REEL/FRAME:005088/0194
Effective date: 19890606
|Apr 4, 1994||FPAY||Fee payment|
Year of fee payment: 4
|Apr 20, 1998||FPAY||Fee payment|
Year of fee payment: 8
|May 14, 2002||REMI||Maintenance fee reminder mailed|
|Oct 30, 2002||LAPS||Lapse for failure to pay maintenance fees|
|Dec 24, 2002||FP||Expired due to failure to pay maintenance fee|
Effective date: 20021030